Solution Source Code

Code Overview

1. Header Files and Namespace:

• <iostream> is included for input and output operations.
• <string> is included for potential future use.
• using namespace std; allows the use of standard functions without prefixing them with std::.

2. User Input Function (ReadPositiveNumber)

• Uses a do-while loop to ensure positive input.
• Prompts the user to enter a valid number.
• Reads and returns the validated floating-point number.

3. Remainder Calculation Function (CalculateRemainder)

• Computes the remaining amount: Remainder=TotalCashPaid−TotalBill\text{Remainder} = \text{TotalCashPaid} - \text{TotalBill}Remainder=TotalCashPaid−TotalBill
• Returns the computed remainder.

4. Program Execution (main())

• Calls ReadPositiveNumber() to get total bill and cash paid.
• Calls CalculateRemainder() to compute the remainder.
• Prints:
  • Total Bill
  • Total Cash Paid
  • Remaining Amount (Change)
• Returns 0 to indicate successful execution.

This structured explanation ensures clarity and ease of understanding.